Site distribution and aliasing effects in the inversion for load coefficients and geocenter motion from GPS data

Precise GPS measurements of elastic relative site displacements due to surface mass loading offer important constraints on global surface mass transport. We investigate effects of site distribution and aliasing by higher-degree (n greater than or equal 2) loading terms on inversion of GPS data for n...

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Bibliographic Details
Published in:Geophysical research letters 2002-12, Vol.29 (24), p.63-1-63-4
Main Authors: Wu, Xiaoping, Argus, Donald F., Heflin, Michael B., Ivins, Erik R., Webb, Frank H.
Format: Article
Language:English
Subjects:
Aliasing
Approximation
Estimates
Inverse
Inversions
Mathematical analysis
Space Communications, Spacecraft Communications, Command And Tracking
Stress concentration
Uncertainty
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Summary:Precise GPS measurements of elastic relative site displacements due to surface mass loading offer important constraints on global surface mass transport. We investigate effects of site distribution and aliasing by higher-degree (n greater than or equal 2) loading terms on inversion of GPS data for n = 1 load coefficients and geocenter motion. Covariance and simulation analyses are conducted to assess the sensitivity of the inversion to aliasing and mismodeling errors and possible uncertainties in the n = 1 load coefficient determination. We found that the use of center-of-figure approximation in the inverse formulation could cause 10- 15% errors in the inverted load coefficients. n = 1 load estimates may be contaminated significantly by unknown higher-degree terms, depending on the load scenario and the GPS site distribution. The uncertainty in n = 1 zonal load estimate is at the level of 80 - 95% for two load scenarios.
ISSN:0094-8276
1944-8007
DOI:10.1029/2002GL016324